Upgrade CPAN

Force CPAN to produce a list of all the modules that have updates and update them:

/usr/bin/perl -MCPAN -e 'CPAN::Shell->install(CPAN::Shell->r)'

Perlrun

Here is an excerpt from 'man perlrun' about the important command line switches used when doing perl one-liners.

-a turns on autosplit mode when used with a -n or -p. An implicit
split command to the @F array is done as the first thing inside the
implicit while loop produced by the -n or -p.
perl -ane 'print pop(@F), "\n";'
is equivalent to
while (<>) {
@F = split(' ');
print pop(@F), "\n";
}
An alternate delimiter may be specified using -F.

-e commandline
may be used to enter one line of script. If -e is given, Perl will
not look for a script filename in the argument list. Multiple -e
commands may be given to build up a multi-line script. Make sure to
use semicolons where you would in a normal program.

-n causes Perl to assume the following loop around your script, which
makes it iterate over filename arguments somewhat like sed -n or
awk:
while (<>) {
... # your script goes here
}
Note that the lines are not printed by default. See -p to have
lines printed. If a file named by an argument cannot be opened for
some reason, Perl warns you about it, and moves on to the next file.

-p causes Perl to assume the following loop around your script, which
makes it iterate over filename arguments somewhat like sed:
while (<>) {
... # your script goes here
} continue {
print or die "-p destination: $!\n";
}
If a file named by an argument cannot be opened for some reason,
Perl warns you about it, and moves on to the next file. Note that
the lines are printed automatically. An error occuring during
printing is treated as fatal. To suppress printing use the -n
switch. A -p overrides a -n switch.